ip adress problem in smal network with router

[gilwart]

I have to build a small network with 3 pc's connected to internet via a router/hub.
The 3 PC's are exactly the same with 3 original different version of xp home.
The router is configurated so:
DHCP with a range of 50 adress begining with 192.168.1.10
mask 255.255.255.0
the ip of the router/hub is 192.168.1.1

all the 3 PC's are configured with XP home to have automaticaly an ip from dhcp. But the 3 have the same ip: 192.168.1.10! And no error message
Amazing, how is it possible?
the 3 can go on internet, the 3 have access to the router but no access to each others.
when I choose fix IP to each PC, I have no more access to Internet and no access to each others.
I take my portable PC and when I connect it to the hub, it take the ip 192.168.1.11, have access to internet but cannot see other pc's
I install other network card in PC's and optain different IP (192.168.1.12, 13, 14) but without seing anybody on the network
I install netbeui from the cd of xp and then, I can see in the network other pc's (but after a long time) but with access denied to sharing.
Can somebody help? I need to understand!

 

[smah]

what happens if go to a command prompt and type:
ipconfig /release
ipconfig /renew
on each of them? What you're describing shouldn't be possible.

 

[bcastner]

Very strange problem.

Your router is likely at fault, or pilot error on your part. You obviously changed the default DHCP scope on the router; it may not like this. I know some IBM and 3Coms do not like it at all.

On the router:
. Check for new firmware from the manufacturer's web site
. If nothing from the web site, revert the router to its factory settings.

On all the PCs do this checklist:

1. Make certain they all have unique computer names; this is not directly the problem, but is related.

2. Under the property sheet for the adapter, TCP/IP properties, Advanced, WINS tab, disable LMHOSTS, WINS, and check that Netbios over TCP/IP is enabled.

3. Any static IP device should, (check the documentation for the router) either be safely inside the DHCP scope of the router, or safely outside the scope (router firmware dependent).

A firm power-off reset of routers and all machines should resolve the issue. This is not a PC client issue, it is a router one. If the router still screws up DHCP replace it.